
12/9/04
Page 5 of 15
2003 Fairchild Semiconductor Corporation
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A
FOD2741B
FOD2741C
I
(LED)
V
(LED)
V
COMP
V
COMP
I
CEO
V
CE
V
REF
V
CE
I
(LED)
V
F
V
REF
V
REF
8
2
3
2
3
V
V
V
6
7
5
I
(LED)
I
(LED)
I
C
I
(OFF)
I
REF
8
6
2
3
2
3
2
3
V
V
7
5
8
6
7
5
8
6
7
5
8
6
2
3
7
5
R1
8
6
R1
R2
7
5
FIG. 1. V
REF
, V
F,
I
LED
(min) TEST CIRCUIT
FIG. 3. I
REF
TEST CIRCUIT
FIG. 5. I
CEO
TEST CIRCUIT
FIG. 6. CTR, V
CE(sat)
TEST CIRCUIT
FIG. 4. I
(OFF)
TEST CIRCUIT
FIG. 2.
V
REF/
V
COMP
TEST CIRCUIT